jumping spider

Jumping spiders are members of the family Salticidae. They have the best eyesight of all spiders, with four big eyes on the front of their head that make them look almost like a ToyotaLand Cruiser. The other four eyes are smaller and are on the back of their head. Their excellent eyesight is used to stalk their prey, spotting unsuspecting insects from up to a couple of feet away, then pouncing on them like a cat.
If you see a spider that has noticed you and is turning its head to watch you, it is probably a jumping spider.

Since jumping spiders catch their prey by hunting, they don't need webs to do that job. The webs they build are instead used for shelter, and are often a crude lean-to placed in a crack of a building.

Salticids have interesting and elaborate courtshipdances, in which the male raises his front legs and waves them in precise ways to attract females. This sort of courtship display wouldn't work in species with poor vision.